By the end of a three-year phase-in, New Jersey could see upwards of $300 million in additional sales tax revenue from the legalization of marijuana, according to a new, joint report by New Jersey United for Marijuana Reform and New Jersey Policy Perspective.

Marijuana (Bruce Bennett/Getty Images)

NJ Advance Media was first to report the findings of the study, which estimated a $305.4 million tax windfall for the Garden State if pot is legalized and taxed at 25 percent. That is based on a current $343 per-ounce price for cannabis on the street, multiplied by the 2.53 million ounces -- roughly 79 tons -- of marijuana consumed on a monthly basis by nearly 366,000 New Jerseyans age 21 and up, the report said, citing federal statistics.

The underground pot market does about $869 million in annual business based on that per-ounce price, NJ Advance Media reported, which would translate to a value of $1.2 billion for the marketplace under legal consumption by residents of New Jersey and neighboring states.

Gov. Chris Christie has never expressed support for legalizing marijuana for recreational use, and would be unlikely to sign a bill to that effect currently pending in the state legislature. New Jersey's medical marijuana law was enacted shortly before Christie took office in 2010.

The NJUMR/NJPP report, which is being officially unveiled Tuesday morning in Trenton, also said enforcing marijuana laws drains both money and resources from law enforcement as well as the courts, which have statistically doled out more severe penalties to blacks than to whites, the NJ Advance Media report said.

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